Please forgive my ignorance... If the 6D has approximately 12 (based on your post), how many do the comparable Nikon cameras(D800?), that everyone raves about, have? In other words, would a jump to 15 bring Canon close to or surpass that of the Sony sensors?

tjbrock42 wrote in post #17509553Please forgive my ignorance... If the 6D has approximately 12 (based on your post), how many do the comparable Nikon cameras(D800?), that everyone raves about, have? In other words, would a jump to 15 bring Canon close to or surpass that of the Sony sensors?

Sorry, I just don't know much about quantifying DR.

if i remember correctly, i think 6D is 11.7 and the best Sony/Nikons are around 13.5

I very much doubt that you can draw any conclusions from the DR of a processed HDR image from a 9 MP video camera (or even gain useful hints) regarding the qualities of any future still sensor that is likely to be at least four times the resolution with much smaller pixels and outputting unprocessed Raw.

tzalman wrote in post #17510270I very much doubt that you can draw any conclusions from the DR of a processed HDR image from a 9 MP video camera (or even gain useful hints) regarding the qualities of any future still sensor that is likely to be at least four times the resolution with much smaller pixels and outputting unprocessed Raw.

Increasing the resolution actually increases the whole-image dynamic range. If they can get 15 stops out of a 9MP sensor, they should be able to do even better with a 60MP sensor.

Shadowblade wrote in post #17510273Increasing the resolution actually increases the whole-image dynamic range. If they can get 15 stops out of a 9MP sensor, they should be able to do even better with a 60MP sensor.

But they aren't getting 15 stops from the sensor. They are getting it from HDR processing well downstream from the sensor:

The C300 Mark II has a newly developed Super 35mm sensor and Canon claims 15 stops for the C300 Mark II but this figure is not based on the sensor but some internal trickery.

The 15 stops is done by taking the raw sensor data and running it through dual image processors at two different ISOs (high and low) before making a composite image from the dual raw stream.

So Canon’s claims for the C300 Mark II at 15 stops needs further scrutiny, like Sony’s claims for 15 stop dynamic range on the Sony A7S which didn’t stack up in the real-world. I expect actual usable dynamic range will be similar to the Sony FS7. Still very good and comparable to film but I think the sensor itself really has a different dynamic range to the one Canon is quoting. It might be that the raw sensor output goes straight to the SDI port for the 4K raw output then we will see what it is really capable of without the Dual DIGIC trick.

Magic Lantern, I believe, just reads each line with alternating ISOs. This results in banding and loss of resolution in areas where either the highlights of the high-ISO image or the shadows of the low-ISO image are blown out, since these areas are only using data from every second line to generate the image and interpolating the rest.

If each pixel is, indeed, read twice or duplicated (rather than interpolated as with Magic Lantern) there should be no such loss of resolution and the gain in DR should be as real as that in the Exmor. After all, reading the shadows at full resolution at ISO 800 is exactly the same as reading it at ISO 100 and pushing three stops (as in the Sony sensor) in an ideal sensor, and superior if the sensor is less than ideal.

Is that really what they do? That doesn't really make sense, as red and blue pixels only appear in alternating lines, too, which would mean that red is read at one ISO and blue at the other. What would make more sense is to do two lines at ISO X, then two lines at ISO Y, etc.

John Sheehy wrote in post #17511875Is that really what they do? That doesn't really make sense, as red and blue pixels only appear in alternating lines, too, which would mean that red is read at one ISO and blue at the other. What would make more sense is to do two lines at ISO X, then two lines at ISO Y, etc.

It's something along those lines - not sure of the exact pattern and my description is simplified a lot, but each pixel is only read once, at either a low ISO or a high one.

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